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Authen::SASL(3) 	       User Contributed Perl Documentation		  Authen::SASL(3)

NAME
       Authen::SASL - SASL Authentication framework

SYNOPSIS
	use Authen::SASL;

	$sasl = Authen::SASL->new(
	  mechanism => 'CRAM-MD5 PLAIN ANONYMOUS',
	  callback => {
	    pass => \&fetch_password,
	    user => $user,
	  }
	);

DESCRIPTION
       SASL is a generic mechanism for authentication used by several network protocols.
       Authen::SASL provides an implementation framework that all protocols should be able to
       share.

       The framework allows different implementations of the connection class to be plugged in.
       At the time of writing there were two such plugins.

       Authen::SASL::Perl
	   This module implements several mechanisms and is implemented entirely in Perl.

       Authen::SASL::XS
	   This module uses the Cyrus SASL C-library (both version 1 and 2 are supported).

       Authen::SASL::Cyrus
	   This module is the predecessor to Authen::SASL::XS. It is reccomended to use
	   Authen::SASL::XS

       By default the order in which these plugins are selected is Authen::SASL::XS,
       Authen::SASL::Cyrus and then Authen::SASL::Perl.

       If you want to change it or want to specifically use one implementation only simply do

	use Authen::SASL qw(Perl);

       or if you have another plugin module that supports the Authen::SASL API

	use Authen::SASL qw(My::SASL::Plugin);

   CONTRUCTOR
       new ( OPTIONS )
	   The contructor may be called with or without arguments. Passing arguments is just a
	   short cut to calling the "mechanism" and "callback" methods.

	   callback => { NAME => VALUE, NAME => VALUE, ... }
	       Set the callbacks.  See the callback method for details.

	   mechanism => NAMES
	   mech => NAMES
	       Set the list of mechanisms to choose from.  See the mechanism method for details.

	   debug => VALUE
	       Set the debug level bit-value to "VALUE"

	       Debug output will be sent to "STDERR". The bits of this value are:

		1   Show debug messages in the Perl modules for the mechanisms.
		    (Currently only used in GSSAPI)
		4   With security layers in place show information on packages read.
		8   With security layers in place show information on packages written.

	       The default value is 0.

   METHODS
       mechanism ( )
	   Returns the current list of mechanisms

       mechanism ( NAMES )
	   Set the list of mechanisms to choose from. "NAMES" should be a space separated string
	   of the names.

       callback ( NAME )
	   Returns the current callback associated with "NAME".

       callback ( NAME => VALUE, NAME => VALUE, ... )
	   Sets the given callbacks to the given values

       client_new ( SERVICE, HOST, SECURITY )
	   Creates and returns a new connection object for a client-side connection.

       server_new ( SERVICE, HOST, OPTIONS )
	   Creates and returns a new connection object for a server-side connection.

       error ( )
	   Returns any error from the last connection

The Connection Class
       server_start ( CHALLENGE )
	   server_start begins the authentication using the chosen mechanism.  If the mechanism
	   is not supported by the installed SASL it fails.  Because for some mechanisms the
	   client has to start the negotiation, you can give the client challenge as a parameter.

       server_step ( CHALLENGE )
	   server_step performs the next step in the negotiation process. The first parameter you
	   give is the clients challenge/response.

       client_start ( )
	   The initial step to be performed. Returns the initial value to pass to the server or
	   an empty list on error.

       client_step ( CHALLENGE )
	   This method is called when a response from the server requires it. CHALLENGE is the
	   value from the server. Returns the next value to pass to the server or an empty list
	   on error.

       need_step ( )
	   Returns true if the selected mechanism requires another step before completion (error
	   or success).

       answer ( NAME )
	   The method will return the value returned from the last call to the callback NAME

       property ( NAME )
	   Returns the property value associated with "NAME".

       property ( NAME => VALUE, NAME => VALUE, ... )
	   Sets the named properties to their associated values.

       service ( )
	   Returns the service argument that was passed to *_new-methods.

       host ( )
	   Returns the host argument that was passed to *_new-methods.

       mechanism ( )
	   Returns the name of the chosen mechanism.

       is_success ( )
	   Once need_step() returns false, then you can check if the authentication succeeded by
	   calling this method which returns a boolean value.

   Callbacks
       There are three different ways in which a callback may be passed

       CODEREF
	   If the value passed is a code reference then, when needed, it will be called and the
	   connection object will be passed as the first argument. In addition some callbacks may
	   be passed additional arguments.

       ARRAYREF
	   If the value passed is an array reference, the first element in the array must be a
	   code reference. When the callback is called the code reference will be called with the
	   connection object passed as the first argument and all other values from the array
	   passed after.

       SCALAR
	   All other values passed will be used directly. ie it is the same as passing an code
	   reference that, when called, returns the value.

SEE ALSO
       Authen::SASL::Perl, Authen::SASL::XS, Authen::SASL::Cyrus

AUTHOR
       Graham Barr <gbarr@pobox.com>

       Please report any bugs, or post any suggestions, to the perl-ldap mailing list
       <perl-ldap@perl.org>

COPYRIGHT
       Copyright (c) 1998-2005 Graham Barr. All rights reserved. This program is free software;
       you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.3				    2010-03-11				  Authen::SASL(3)
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